No. Chantix is not currently recommended for use in pregnancy as it has not been thoroughly studied. It is category c, and although many medications allowed in pregnancy fall into that category, in the case of Chantix you cannot be assured that it is a safe option during pregnancy or lactation. The nicotine patch may be an acceptable option.
No. Well, really the answer is we don't know. There is very little known about Chantix in pregnancy. So far the animal studies done show very little risks. Chantix is not recommended in breastfeeding, however. On the other hand, smoking is a huge risk to pregnancies. If Chantix is the best way to stop smoking, it may be better for you to take it for a short time to stop smoking.